| Message ID | 20221103162623.10286-4-paolo.valente@linaro.org (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | block, bfq: extend bfq to support multi-actuator drives | expand |
On 11/4/22 01:26, Paolo Valente wrote: > With a multi-actuator drive, a process may get associated with multiple > bfq_queues: one queue for each of the N actuators. So, the bfq_io_cq > data structure must be able to accommodate its per-queue persistent > information for N queues. Currently it stores this information for > just one queue, in several scalar fields. > > This is a preparatory commit for moving to accommodating persistent > information for N queues. In particular, this commit packs all the > above scalar fields into a single data structure. Then there is now > only one fieldi, in bfq_io_cq, that stores all the above information. This s/fieldi/field Other than that, looks OK to me. Reviewed-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > scalar field will then be turned into an array by a following commit. > > Suggested-by: Damien Le Moal <damien.lemoal@opensource.wdc.com> > Signed-off-by: Gianmarco Lusvardi <glusvardi@posteo.net> > Signed-off-by: Giulio Barabino <giuliobarabino99@gmail.com> > Signed-off-by: Emiliano Maccaferri <inbox@emilianomaccaferri.com> > Signed-off-by: Paolo Valente <paolo.valente@linaro.org> > --- > block/bfq-iosched.c | 129 +++++++++++++++++++++++++------------------- > block/bfq-iosched.h | 52 ++++++++++-------- > 2 files changed, 105 insertions(+), 76 deletions(-) > > diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c > index ec4b0e70265f..01528182c0c5 100644 > --- a/block/bfq-iosched.c > +++ b/block/bfq-iosched.c > @@ -404,9 +404,10 @@ void bic_set_bfqq(struct bfq_io_cq *bic, > * we cancel the stable merge if > * bic->stable_merge_bfqq == bfqq. > */ > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > bic->bfqq[is_sync][actuator_idx] = bfqq; > > - if (bfqq && bic->stable_merge_bfqq == bfqq) { > + if (bfqq && bfqq_data->stable_merge_bfqq == bfqq) { > /* > * Actually, these same instructions are executed also > * in bfq_setup_cooperator, in case of abort or actual > @@ -415,9 +416,9 @@ void bic_set_bfqq(struct bfq_io_cq *bic, > * did so, we would nest even more complexity in this > * function. > */ > - bfq_put_stable_ref(bic->stable_merge_bfqq); > + bfq_put_stable_ref(bfqq_data->stable_merge_bfqq); > > - bic->stable_merge_bfqq = NULL; > + bfqq_data->stable_merge_bfqq = NULL; > } > } > > @@ -1174,38 +1175,40 @@ static void > bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, > struct bfq_io_cq *bic, bool bfq_already_existing) > { > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > unsigned int old_wr_coeff = 1; > bool busy = bfq_already_existing && bfq_bfqq_busy(bfqq); > > - if (bic->saved_has_short_ttime) > + if (bfqq_data->saved_has_short_ttime) > bfq_mark_bfqq_has_short_ttime(bfqq); > else > bfq_clear_bfqq_has_short_ttime(bfqq); > > - if (bic->saved_IO_bound) > + if (bfqq_data->saved_IO_bound) > bfq_mark_bfqq_IO_bound(bfqq); > else > bfq_clear_bfqq_IO_bound(bfqq); > > - bfqq->last_serv_time_ns = bic->saved_last_serv_time_ns; > - bfqq->inject_limit = bic->saved_inject_limit; > - bfqq->decrease_time_jif = bic->saved_decrease_time_jif; > + bfqq->last_serv_time_ns = bfqq_data->saved_last_serv_time_ns; > + bfqq->inject_limit = bfqq_data->saved_inject_limit; > + bfqq->decrease_time_jif = bfqq_data->saved_decrease_time_jif; > > - bfqq->entity.new_weight = bic->saved_weight; > - bfqq->ttime = bic->saved_ttime; > - bfqq->io_start_time = bic->saved_io_start_time; > - bfqq->tot_idle_time = bic->saved_tot_idle_time; > + bfqq->entity.new_weight = bfqq_data->saved_weight; > + bfqq->ttime = bfqq_data->saved_ttime; > + bfqq->io_start_time = bfqq_data->saved_io_start_time; > + bfqq->tot_idle_time = bfqq_data->saved_tot_idle_time; > /* > * Restore weight coefficient only if low_latency is on > */ > if (bfqd->low_latency) { > old_wr_coeff = bfqq->wr_coeff; > - bfqq->wr_coeff = bic->saved_wr_coeff; > + bfqq->wr_coeff = bfqq_data->saved_wr_coeff; > } > - bfqq->service_from_wr = bic->saved_service_from_wr; > - bfqq->wr_start_at_switch_to_srt = bic->saved_wr_start_at_switch_to_srt; > - bfqq->last_wr_start_finish = bic->saved_last_wr_start_finish; > - bfqq->wr_cur_max_time = bic->saved_wr_cur_max_time; > + bfqq->service_from_wr = bfqq_data->saved_service_from_wr; > + bfqq->wr_start_at_switch_to_srt = > + bfqq_data->saved_wr_start_at_switch_to_srt; > + bfqq->last_wr_start_finish = bfqq_data->saved_last_wr_start_finish; > + bfqq->wr_cur_max_time = bfqq_data->saved_wr_cur_max_time; > > if (bfqq->wr_coeff > 1 && (bfq_bfqq_in_large_burst(bfqq) || > time_is_before_jiffies(bfqq->last_wr_start_finish + > @@ -1878,7 +1881,7 @@ static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd, > wr_or_deserves_wr = bfqd->low_latency && > (bfqq->wr_coeff > 1 || > (bfq_bfqq_sync(bfqq) && > - (bfqq->bic || RQ_BIC(rq)->stably_merged) && > + (bfqq->bic || RQ_BIC(rq)->bfqq_data.stably_merged) && > (*interactive || soft_rt))); > > /* > @@ -2902,6 +2905,7 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, > void *io_struct, bool request, struct bfq_io_cq *bic) > { > struct bfq_queue *in_service_bfqq, *new_bfqq; > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > > /* if a merge has already been setup, then proceed with that first */ > if (bfqq->new_bfqq) > @@ -2923,21 +2927,21 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, > * stable merging) also if bic is associated with a > * sync queue, but this bfqq is async > */ > - if (bfq_bfqq_sync(bfqq) && bic->stable_merge_bfqq && > + if (bfq_bfqq_sync(bfqq) && bfqq_data->stable_merge_bfqq && > !bfq_bfqq_just_created(bfqq) && > time_is_before_jiffies(bfqq->split_time + > msecs_to_jiffies(bfq_late_stable_merging)) && > time_is_before_jiffies(bfqq->creation_time + > msecs_to_jiffies(bfq_late_stable_merging))) { > struct bfq_queue *stable_merge_bfqq = > - bic->stable_merge_bfqq; > + bfqq_data->stable_merge_bfqq; > int proc_ref = min(bfqq_process_refs(bfqq), > bfqq_process_refs(stable_merge_bfqq)); > > /* deschedule stable merge, because done or aborted here */ > bfq_put_stable_ref(stable_merge_bfqq); > > - bic->stable_merge_bfqq = NULL; > + bfqq_data->stable_merge_bfqq = NULL; > > if (!idling_boosts_thr_without_issues(bfqd, bfqq) && > proc_ref > 0) { > @@ -2946,10 +2950,10 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, > bfq_setup_merge(bfqq, stable_merge_bfqq); > > if (new_bfqq) { > - bic->stably_merged = true; > + bfqq_data->stably_merged = true; > if (new_bfqq->bic) > - new_bfqq->bic->stably_merged = > - true; > + new_bfqq->bic->bfqq_data.stably_merged = > + true; > } > return new_bfqq; > } else > @@ -3048,6 +3052,7 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, > static void bfq_bfqq_save_state(struct bfq_queue *bfqq) > { > struct bfq_io_cq *bic = bfqq->bic; > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > > /* > * If !bfqq->bic, the queue is already shared or its requests > @@ -3057,18 +3062,21 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) > if (!bic) > return; > > - bic->saved_last_serv_time_ns = bfqq->last_serv_time_ns; > - bic->saved_inject_limit = bfqq->inject_limit; > - bic->saved_decrease_time_jif = bfqq->decrease_time_jif; > - > - bic->saved_weight = bfqq->entity.orig_weight; > - bic->saved_ttime = bfqq->ttime; > - bic->saved_has_short_ttime = bfq_bfqq_has_short_ttime(bfqq); > - bic->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); > - bic->saved_io_start_time = bfqq->io_start_time; > - bic->saved_tot_idle_time = bfqq->tot_idle_time; > - bic->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); > - bic->was_in_burst_list = !hlist_unhashed(&bfqq->burst_list_node); > + bfqq_data->saved_last_serv_time_ns = bfqq->last_serv_time_ns; > + bfqq_data->saved_inject_limit = bfqq->inject_limit; > + bfqq_data->saved_decrease_time_jif = bfqq->decrease_time_jif; > + > + bfqq_data->saved_weight = bfqq->entity.orig_weight; > + bfqq_data->saved_ttime = bfqq->ttime; > + bfqq_data->saved_has_short_ttime = > + bfq_bfqq_has_short_ttime(bfqq); > + bfqq_data->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); > + bfqq_data->saved_io_start_time = bfqq->io_start_time; > + bfqq_data->saved_tot_idle_time = bfqq->tot_idle_time; > + bfqq_data->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); > + bfqq_data->was_in_burst_list = > + !hlist_unhashed(&bfqq->burst_list_node); > + > if (unlikely(bfq_bfqq_just_created(bfqq) && > !bfq_bfqq_in_large_burst(bfqq) && > bfqq->bfqd->low_latency)) { > @@ -3081,17 +3089,21 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) > * to bfqq, so that to avoid that bfqq unjustly fails > * to enjoy weight raising if split soon. > */ > - bic->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; > - bic->saved_wr_start_at_switch_to_srt = bfq_smallest_from_now(); > - bic->saved_wr_cur_max_time = bfq_wr_duration(bfqq->bfqd); > - bic->saved_last_wr_start_finish = jiffies; > + bfqq_data->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; > + bfqq_data->saved_wr_start_at_switch_to_srt = > + bfq_smallest_from_now(); > + bfqq_data->saved_wr_cur_max_time = > + bfq_wr_duration(bfqq->bfqd); > + bfqq_data->saved_last_wr_start_finish = jiffies; > } else { > - bic->saved_wr_coeff = bfqq->wr_coeff; > - bic->saved_wr_start_at_switch_to_srt = > + bfqq_data->saved_wr_coeff = bfqq->wr_coeff; > + bfqq_data->saved_wr_start_at_switch_to_srt = > bfqq->wr_start_at_switch_to_srt; > - bic->saved_service_from_wr = bfqq->service_from_wr; > - bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; > - bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; > + bfqq_data->saved_service_from_wr = > + bfqq->service_from_wr; > + bfqq_data->saved_last_wr_start_finish = > + bfqq->last_wr_start_finish; > + bfqq_data->saved_wr_cur_max_time = bfqq->wr_cur_max_time; > } > } > > @@ -5413,6 +5425,7 @@ static void bfq_exit_icq(struct io_cq *icq) > unsigned long flags; > unsigned int act_idx; > unsigned int num_actuators; > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > > /* > * bfqd is NULL if scheduler already exited, and in that case > @@ -5432,8 +5445,8 @@ static void bfq_exit_icq(struct io_cq *icq) > num_actuators = BFQ_MAX_ACTUATORS; > } > > - if (bic->stable_merge_bfqq) > - bfq_put_stable_ref(bic->stable_merge_bfqq); > + if (bfqq_data->stable_merge_bfqq) > + bfq_put_stable_ref(bfqq_data->stable_merge_bfqq); > > for (act_idx = 0; act_idx < num_actuators; act_idx++) { > bfq_exit_icq_bfqq(bic, true, act_idx); > @@ -5624,13 +5637,14 @@ bfq_do_early_stable_merge(struct bfq_data *bfqd, struct bfq_queue *bfqq, > { > struct bfq_queue *new_bfqq = > bfq_setup_merge(bfqq, last_bfqq_created); > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > > if (!new_bfqq) > return bfqq; > > if (new_bfqq->bic) > - new_bfqq->bic->stably_merged = true; > - bic->stably_merged = true; > + new_bfqq->bic->bfqq_data.stably_merged = true; > + bfqq_data->stably_merged = true; > > /* > * Reusing merge functions. This implies that > @@ -5699,6 +5713,7 @@ static struct bfq_queue *bfq_do_or_sched_stable_merge(struct bfq_data *bfqd, > &bfqd->last_bfqq_created; > > struct bfq_queue *last_bfqq_created = *source_bfqq; > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > > /* > * If last_bfqq_created has not been set yet, then init it. If > @@ -5760,7 +5775,7 @@ static struct bfq_queue *bfq_do_or_sched_stable_merge(struct bfq_data *bfqd, > /* > * Record the bfqq to merge to. > */ > - bic->stable_merge_bfqq = last_bfqq_created; > + bfqq_data->stable_merge_bfqq = last_bfqq_created; > } > } > > @@ -6681,6 +6696,7 @@ static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, > { > unsigned int act_idx = bfq_actuator_index(bfqd, bio); > struct bfq_queue *bfqq = bic_to_bfqq(bic, is_sync, act_idx); > + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; > > if (likely(bfqq && bfqq != &bfqd->oom_bfqq)) > return bfqq; > @@ -6694,12 +6710,12 @@ static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, > > bic_set_bfqq(bic, bfqq, is_sync, act_idx); > if (split && is_sync) { > - if ((bic->was_in_burst_list && bfqd->large_burst) || > - bic->saved_in_large_burst) > + if ((bfqq_data->was_in_burst_list && bfqd->large_burst) || > + bfqq_data->saved_in_large_burst) > bfq_mark_bfqq_in_large_burst(bfqq); > else { > bfq_clear_bfqq_in_large_burst(bfqq); > - if (bic->was_in_burst_list) > + if (bfqq_data->was_in_burst_list) > /* > * If bfqq was in the current > * burst list before being > @@ -6788,6 +6804,7 @@ static struct bfq_queue *bfq_init_rq(struct request *rq) > struct bfq_queue *bfqq; > bool new_queue = false; > bool bfqq_already_existing = false, split = false; > + struct bfq_iocq_bfqq_data *bfqq_data; > > if (unlikely(!rq->elv.icq)) > return NULL; > @@ -6811,15 +6828,17 @@ static struct bfq_queue *bfq_init_rq(struct request *rq) > bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, false, is_sync, > &new_queue); > > + bfqq_data = &bic->bfqq_data; > + > if (likely(!new_queue)) { > /* If the queue was seeky for too long, break it apart. */ > if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq) && > - !bic->stably_merged) { > + !bfqq_data->stably_merged) { > struct bfq_queue *old_bfqq = bfqq; > > /* Update bic before losing reference to bfqq */ > if (bfq_bfqq_in_large_burst(bfqq)) > - bic->saved_in_large_burst = true; > + bfqq_data->saved_in_large_burst = true; > > bfqq = bfq_split_bfqq(bic, bfqq); > split = true; > diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h > index bfcbd8ea9000..f2e8ab91951c 100644 > --- a/block/bfq-iosched.h > +++ b/block/bfq-iosched.h > @@ -411,27 +411,9 @@ struct bfq_queue { > }; > > /** > - * struct bfq_io_cq - per (request_queue, io_context) structure. > - */ > -struct bfq_io_cq { > - /* associated io_cq structure */ > - struct io_cq icq; /* must be the first member */ > - /* > - * Matrix of associated process queues: first row for async > - * queues, second row sync queues. Each row contains one > - * column for each actuator. An I/O request generated by the > - * process is inserted into the queue pointed by bfqq[i][j] if > - * the request is to be served by the j-th actuator of the > - * drive, where i==0 or i==1, depending on whether the request > - * is async or sync. So there is a distinct queue for each > - * actuator. > - */ > - struct bfq_queue *bfqq[2][BFQ_MAX_ACTUATORS]; > - /* per (request_queue, blkcg) ioprio */ > - int ioprio; > -#ifdef CONFIG_BFQ_GROUP_IOSCHED > - uint64_t blkcg_serial_nr; /* the current blkcg serial */ > -#endif > +* struct bfq_data - bfqq data unique and persistent for associated bfq_io_cq > +*/ > +struct bfq_iocq_bfqq_data { > /* > * Snapshot of the has_short_time flag before merging; taken > * to remember its value while the queue is merged, so as to > @@ -486,6 +468,34 @@ struct bfq_io_cq { > struct bfq_queue *stable_merge_bfqq; > > bool stably_merged; /* non splittable if true */ > +}; > + > +/** > + * struct bfq_io_cq - per (request_queue, io_context) structure. > + */ > +struct bfq_io_cq { > + /* associated io_cq structure */ > + struct io_cq icq; /* must be the first member */ > + /* > + * Matrix of associated process queues: first row for async > + * queues, second row sync queues. Each row contains one > + * column for each actuator. An I/O request generated by the > + * process is inserted into the queue pointed by bfqq[i][j] if > + * the request is to be served by the j-th actuator of the > + * drive, where i==0 or i==1, depending on whether the request > + * is async or sync. So there is a distinct queue for each > + * actuator. > + */ > + struct bfq_queue *bfqq[2][BFQ_MAX_ACTUATORS]; > + /* per (request_queue, blkcg) ioprio */ > + int ioprio; > +#ifdef CONFIG_BFQ_GROUP_IOSCHED > + uint64_t blkcg_serial_nr; /* the current blkcg serial */ > +#endif > + > + /* persistent data for associated synchronous process queue */ > + struct bfq_iocq_bfqq_data bfqq_data; > + > unsigned int requests; /* Number of requests this process has in flight */ > }; >
diff --git a/block/bfq-iosched.c b/block/bfq-iosched.c index ec4b0e70265f..01528182c0c5 100644 --- a/block/bfq-iosched.c +++ b/block/bfq-iosched.c @@ -404,9 +404,10 @@ void bic_set_bfqq(struct bfq_io_cq *bic, * we cancel the stable merge if * bic->stable_merge_bfqq == bfqq. */ + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; bic->bfqq[is_sync][actuator_idx] = bfqq; - if (bfqq && bic->stable_merge_bfqq == bfqq) { + if (bfqq && bfqq_data->stable_merge_bfqq == bfqq) { /* * Actually, these same instructions are executed also * in bfq_setup_cooperator, in case of abort or actual @@ -415,9 +416,9 @@ void bic_set_bfqq(struct bfq_io_cq *bic, * did so, we would nest even more complexity in this * function. */ - bfq_put_stable_ref(bic->stable_merge_bfqq); + bfq_put_stable_ref(bfqq_data->stable_merge_bfqq); - bic->stable_merge_bfqq = NULL; + bfqq_data->stable_merge_bfqq = NULL; } } @@ -1174,38 +1175,40 @@ static void bfq_bfqq_resume_state(struct bfq_queue *bfqq, struct bfq_data *bfqd, struct bfq_io_cq *bic, bool bfq_already_existing) { + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; unsigned int old_wr_coeff = 1; bool busy = bfq_already_existing && bfq_bfqq_busy(bfqq); - if (bic->saved_has_short_ttime) + if (bfqq_data->saved_has_short_ttime) bfq_mark_bfqq_has_short_ttime(bfqq); else bfq_clear_bfqq_has_short_ttime(bfqq); - if (bic->saved_IO_bound) + if (bfqq_data->saved_IO_bound) bfq_mark_bfqq_IO_bound(bfqq); else bfq_clear_bfqq_IO_bound(bfqq); - bfqq->last_serv_time_ns = bic->saved_last_serv_time_ns; - bfqq->inject_limit = bic->saved_inject_limit; - bfqq->decrease_time_jif = bic->saved_decrease_time_jif; + bfqq->last_serv_time_ns = bfqq_data->saved_last_serv_time_ns; + bfqq->inject_limit = bfqq_data->saved_inject_limit; + bfqq->decrease_time_jif = bfqq_data->saved_decrease_time_jif; - bfqq->entity.new_weight = bic->saved_weight; - bfqq->ttime = bic->saved_ttime; - bfqq->io_start_time = bic->saved_io_start_time; - bfqq->tot_idle_time = bic->saved_tot_idle_time; + bfqq->entity.new_weight = bfqq_data->saved_weight; + bfqq->ttime = bfqq_data->saved_ttime; + bfqq->io_start_time = bfqq_data->saved_io_start_time; + bfqq->tot_idle_time = bfqq_data->saved_tot_idle_time; /* * Restore weight coefficient only if low_latency is on */ if (bfqd->low_latency) { old_wr_coeff = bfqq->wr_coeff; - bfqq->wr_coeff = bic->saved_wr_coeff; + bfqq->wr_coeff = bfqq_data->saved_wr_coeff; } - bfqq->service_from_wr = bic->saved_service_from_wr; - bfqq->wr_start_at_switch_to_srt = bic->saved_wr_start_at_switch_to_srt; - bfqq->last_wr_start_finish = bic->saved_last_wr_start_finish; - bfqq->wr_cur_max_time = bic->saved_wr_cur_max_time; + bfqq->service_from_wr = bfqq_data->saved_service_from_wr; + bfqq->wr_start_at_switch_to_srt = + bfqq_data->saved_wr_start_at_switch_to_srt; + bfqq->last_wr_start_finish = bfqq_data->saved_last_wr_start_finish; + bfqq->wr_cur_max_time = bfqq_data->saved_wr_cur_max_time; if (bfqq->wr_coeff > 1 && (bfq_bfqq_in_large_burst(bfqq) || time_is_before_jiffies(bfqq->last_wr_start_finish + @@ -1878,7 +1881,7 @@ static void bfq_bfqq_handle_idle_busy_switch(struct bfq_data *bfqd, wr_or_deserves_wr = bfqd->low_latency && (bfqq->wr_coeff > 1 || (bfq_bfqq_sync(bfqq) && - (bfqq->bic || RQ_BIC(rq)->stably_merged) && + (bfqq->bic || RQ_BIC(rq)->bfqq_data.stably_merged) && (*interactive || soft_rt))); /* @@ -2902,6 +2905,7 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, void *io_struct, bool request, struct bfq_io_cq *bic) { struct bfq_queue *in_service_bfqq, *new_bfqq; + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; /* if a merge has already been setup, then proceed with that first */ if (bfqq->new_bfqq) @@ -2923,21 +2927,21 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, * stable merging) also if bic is associated with a * sync queue, but this bfqq is async */ - if (bfq_bfqq_sync(bfqq) && bic->stable_merge_bfqq && + if (bfq_bfqq_sync(bfqq) && bfqq_data->stable_merge_bfqq && !bfq_bfqq_just_created(bfqq) && time_is_before_jiffies(bfqq->split_time + msecs_to_jiffies(bfq_late_stable_merging)) && time_is_before_jiffies(bfqq->creation_time + msecs_to_jiffies(bfq_late_stable_merging))) { struct bfq_queue *stable_merge_bfqq = - bic->stable_merge_bfqq; + bfqq_data->stable_merge_bfqq; int proc_ref = min(bfqq_process_refs(bfqq), bfqq_process_refs(stable_merge_bfqq)); /* deschedule stable merge, because done or aborted here */ bfq_put_stable_ref(stable_merge_bfqq); - bic->stable_merge_bfqq = NULL; + bfqq_data->stable_merge_bfqq = NULL; if (!idling_boosts_thr_without_issues(bfqd, bfqq) && proc_ref > 0) { @@ -2946,10 +2950,10 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, bfq_setup_merge(bfqq, stable_merge_bfqq); if (new_bfqq) { - bic->stably_merged = true; + bfqq_data->stably_merged = true; if (new_bfqq->bic) - new_bfqq->bic->stably_merged = - true; + new_bfqq->bic->bfqq_data.stably_merged = + true; } return new_bfqq; } else @@ -3048,6 +3052,7 @@ bfq_setup_cooperator(struct bfq_data *bfqd, struct bfq_queue *bfqq, static void bfq_bfqq_save_state(struct bfq_queue *bfqq) { struct bfq_io_cq *bic = bfqq->bic; + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; /* * If !bfqq->bic, the queue is already shared or its requests @@ -3057,18 +3062,21 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) if (!bic) return; - bic->saved_last_serv_time_ns = bfqq->last_serv_time_ns; - bic->saved_inject_limit = bfqq->inject_limit; - bic->saved_decrease_time_jif = bfqq->decrease_time_jif; - - bic->saved_weight = bfqq->entity.orig_weight; - bic->saved_ttime = bfqq->ttime; - bic->saved_has_short_ttime = bfq_bfqq_has_short_ttime(bfqq); - bic->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); - bic->saved_io_start_time = bfqq->io_start_time; - bic->saved_tot_idle_time = bfqq->tot_idle_time; - bic->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); - bic->was_in_burst_list = !hlist_unhashed(&bfqq->burst_list_node); + bfqq_data->saved_last_serv_time_ns = bfqq->last_serv_time_ns; + bfqq_data->saved_inject_limit = bfqq->inject_limit; + bfqq_data->saved_decrease_time_jif = bfqq->decrease_time_jif; + + bfqq_data->saved_weight = bfqq->entity.orig_weight; + bfqq_data->saved_ttime = bfqq->ttime; + bfqq_data->saved_has_short_ttime = + bfq_bfqq_has_short_ttime(bfqq); + bfqq_data->saved_IO_bound = bfq_bfqq_IO_bound(bfqq); + bfqq_data->saved_io_start_time = bfqq->io_start_time; + bfqq_data->saved_tot_idle_time = bfqq->tot_idle_time; + bfqq_data->saved_in_large_burst = bfq_bfqq_in_large_burst(bfqq); + bfqq_data->was_in_burst_list = + !hlist_unhashed(&bfqq->burst_list_node); + if (unlikely(bfq_bfqq_just_created(bfqq) && !bfq_bfqq_in_large_burst(bfqq) && bfqq->bfqd->low_latency)) { @@ -3081,17 +3089,21 @@ static void bfq_bfqq_save_state(struct bfq_queue *bfqq) * to bfqq, so that to avoid that bfqq unjustly fails * to enjoy weight raising if split soon. */ - bic->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; - bic->saved_wr_start_at_switch_to_srt = bfq_smallest_from_now(); - bic->saved_wr_cur_max_time = bfq_wr_duration(bfqq->bfqd); - bic->saved_last_wr_start_finish = jiffies; + bfqq_data->saved_wr_coeff = bfqq->bfqd->bfq_wr_coeff; + bfqq_data->saved_wr_start_at_switch_to_srt = + bfq_smallest_from_now(); + bfqq_data->saved_wr_cur_max_time = + bfq_wr_duration(bfqq->bfqd); + bfqq_data->saved_last_wr_start_finish = jiffies; } else { - bic->saved_wr_coeff = bfqq->wr_coeff; - bic->saved_wr_start_at_switch_to_srt = + bfqq_data->saved_wr_coeff = bfqq->wr_coeff; + bfqq_data->saved_wr_start_at_switch_to_srt = bfqq->wr_start_at_switch_to_srt; - bic->saved_service_from_wr = bfqq->service_from_wr; - bic->saved_last_wr_start_finish = bfqq->last_wr_start_finish; - bic->saved_wr_cur_max_time = bfqq->wr_cur_max_time; + bfqq_data->saved_service_from_wr = + bfqq->service_from_wr; + bfqq_data->saved_last_wr_start_finish = + bfqq->last_wr_start_finish; + bfqq_data->saved_wr_cur_max_time = bfqq->wr_cur_max_time; } } @@ -5413,6 +5425,7 @@ static void bfq_exit_icq(struct io_cq *icq) unsigned long flags; unsigned int act_idx; unsigned int num_actuators; + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; /* * bfqd is NULL if scheduler already exited, and in that case @@ -5432,8 +5445,8 @@ static void bfq_exit_icq(struct io_cq *icq) num_actuators = BFQ_MAX_ACTUATORS; } - if (bic->stable_merge_bfqq) - bfq_put_stable_ref(bic->stable_merge_bfqq); + if (bfqq_data->stable_merge_bfqq) + bfq_put_stable_ref(bfqq_data->stable_merge_bfqq); for (act_idx = 0; act_idx < num_actuators; act_idx++) { bfq_exit_icq_bfqq(bic, true, act_idx); @@ -5624,13 +5637,14 @@ bfq_do_early_stable_merge(struct bfq_data *bfqd, struct bfq_queue *bfqq, { struct bfq_queue *new_bfqq = bfq_setup_merge(bfqq, last_bfqq_created); + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; if (!new_bfqq) return bfqq; if (new_bfqq->bic) - new_bfqq->bic->stably_merged = true; - bic->stably_merged = true; + new_bfqq->bic->bfqq_data.stably_merged = true; + bfqq_data->stably_merged = true; /* * Reusing merge functions. This implies that @@ -5699,6 +5713,7 @@ static struct bfq_queue *bfq_do_or_sched_stable_merge(struct bfq_data *bfqd, &bfqd->last_bfqq_created; struct bfq_queue *last_bfqq_created = *source_bfqq; + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; /* * If last_bfqq_created has not been set yet, then init it. If @@ -5760,7 +5775,7 @@ static struct bfq_queue *bfq_do_or_sched_stable_merge(struct bfq_data *bfqd, /* * Record the bfqq to merge to. */ - bic->stable_merge_bfqq = last_bfqq_created; + bfqq_data->stable_merge_bfqq = last_bfqq_created; } } @@ -6681,6 +6696,7 @@ static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, { unsigned int act_idx = bfq_actuator_index(bfqd, bio); struct bfq_queue *bfqq = bic_to_bfqq(bic, is_sync, act_idx); + struct bfq_iocq_bfqq_data *bfqq_data = &bic->bfqq_data; if (likely(bfqq && bfqq != &bfqd->oom_bfqq)) return bfqq; @@ -6694,12 +6710,12 @@ static struct bfq_queue *bfq_get_bfqq_handle_split(struct bfq_data *bfqd, bic_set_bfqq(bic, bfqq, is_sync, act_idx); if (split && is_sync) { - if ((bic->was_in_burst_list && bfqd->large_burst) || - bic->saved_in_large_burst) + if ((bfqq_data->was_in_burst_list && bfqd->large_burst) || + bfqq_data->saved_in_large_burst) bfq_mark_bfqq_in_large_burst(bfqq); else { bfq_clear_bfqq_in_large_burst(bfqq); - if (bic->was_in_burst_list) + if (bfqq_data->was_in_burst_list) /* * If bfqq was in the current * burst list before being @@ -6788,6 +6804,7 @@ static struct bfq_queue *bfq_init_rq(struct request *rq) struct bfq_queue *bfqq; bool new_queue = false; bool bfqq_already_existing = false, split = false; + struct bfq_iocq_bfqq_data *bfqq_data; if (unlikely(!rq->elv.icq)) return NULL; @@ -6811,15 +6828,17 @@ static struct bfq_queue *bfq_init_rq(struct request *rq) bfqq = bfq_get_bfqq_handle_split(bfqd, bic, bio, false, is_sync, &new_queue); + bfqq_data = &bic->bfqq_data; + if (likely(!new_queue)) { /* If the queue was seeky for too long, break it apart. */ if (bfq_bfqq_coop(bfqq) && bfq_bfqq_split_coop(bfqq) && - !bic->stably_merged) { + !bfqq_data->stably_merged) { struct bfq_queue *old_bfqq = bfqq; /* Update bic before losing reference to bfqq */ if (bfq_bfqq_in_large_burst(bfqq)) - bic->saved_in_large_burst = true; + bfqq_data->saved_in_large_burst = true; bfqq = bfq_split_bfqq(bic, bfqq); split = true; diff --git a/block/bfq-iosched.h b/block/bfq-iosched.h index bfcbd8ea9000..f2e8ab91951c 100644 --- a/block/bfq-iosched.h +++ b/block/bfq-iosched.h @@ -411,27 +411,9 @@ struct bfq_queue { }; /** - * struct bfq_io_cq - per (request_queue, io_context) structure. - */ -struct bfq_io_cq { - /* associated io_cq structure */ - struct io_cq icq; /* must be the first member */ - /* - * Matrix of associated process queues: first row for async - * queues, second row sync queues. Each row contains one - * column for each actuator. An I/O request generated by the - * process is inserted into the queue pointed by bfqq[i][j] if - * the request is to be served by the j-th actuator of the - * drive, where i==0 or i==1, depending on whether the request - * is async or sync. So there is a distinct queue for each - * actuator. - */ - struct bfq_queue *bfqq[2][BFQ_MAX_ACTUATORS]; - /* per (request_queue, blkcg) ioprio */ - int ioprio; -#ifdef CONFIG_BFQ_GROUP_IOSCHED - uint64_t blkcg_serial_nr; /* the current blkcg serial */ -#endif +* struct bfq_data - bfqq data unique and persistent for associated bfq_io_cq +*/ +struct bfq_iocq_bfqq_data { /* * Snapshot of the has_short_time flag before merging; taken * to remember its value while the queue is merged, so as to @@ -486,6 +468,34 @@ struct bfq_io_cq { struct bfq_queue *stable_merge_bfqq; bool stably_merged; /* non splittable if true */ +}; + +/** + * struct bfq_io_cq - per (request_queue, io_context) structure. + */ +struct bfq_io_cq { + /* associated io_cq structure */ + struct io_cq icq; /* must be the first member */ + /* + * Matrix of associated process queues: first row for async + * queues, second row sync queues. Each row contains one + * column for each actuator. An I/O request generated by the + * process is inserted into the queue pointed by bfqq[i][j] if + * the request is to be served by the j-th actuator of the + * drive, where i==0 or i==1, depending on whether the request + * is async or sync. So there is a distinct queue for each + * actuator. + */ + struct bfq_queue *bfqq[2][BFQ_MAX_ACTUATORS]; + /* per (request_queue, blkcg) ioprio */ + int ioprio; +#ifdef CONFIG_BFQ_GROUP_IOSCHED + uint64_t blkcg_serial_nr; /* the current blkcg serial */ +#endif + + /* persistent data for associated synchronous process queue */ + struct bfq_iocq_bfqq_data bfqq_data; + unsigned int requests; /* Number of requests this process has in flight */ };